Stopper for boiler-tubes or hollow shafting.



No. 700,351 I Patented May 20, I902.

' H. T. MASON.

STUPPEB FUR BOILER TUBES UR HOLLOW "SHAFTING.

(Application filed Aug. 14, 1901.)-'

(No Model.)

IN VENT 0R UNITED STATns PATENT OFFI E.-

HENRY T. MAS-ON, or.cnIoAeoQILLInoIs."

STOPPER' FOR BOILER-TUBES OR HofLLow SHAFTING.

srnorrronrron. forming part of e ers; a ate. roossl, dated May 20, 19oz.

Application filed August 14,1901. Serial to. 72,015. No model.)

Be it known that 1,,HENBYT." MASON, a citizen of the United States, residing at Chicago,

a To all whom/it may concern:

in the county of Cook and State of Illinois,

struction of the stopper and in the peculiar arrangement and combination of .itsvarious parts, as will be fully hereinafterdescribed,

and shown in the drawings, in which-e Figure 1 is a vertical central section through a section of hollow sh'afting andthrough my improved stopper applied thereto. Fig. 2is a cross-section on line a at of Fig. 1. -Fig. 3 is a plan view, and Fig. 4 is a central sectional view through a modified formofstopper and a portion of the boiler-tube to which it is applied.

In the drawings thus-briefly described the reference-letter A designates a hollow-shaft in which a stopper B may be located. at different points in the interior thereof for the purposes above set forth.

In construction the stopper jcomprises'a' head formed in sections, such as O, preferably three in number, as shown in Fig. 2. The head has also a tapering opening D extending centrally and longitudinally therethrough in which, isfitted a conical wedgeE. The wedge is preferably solid and is;pro- Vided with a shank or stem F,which projects beyond the head and is threaded at its free end, as at a. Loosely sleevedupon the shank is a clamping member or plate G, preferably formed of steel and conical in configuration. Intermediate the clamp and the head end adjacent to the clamp is arranged a ring of compressible material, preferably lead. The packing-ring is of a size to cover,when compressed and expanded by the clamping memher, the joints between adjoining sections of the head, andthus prevent leakage through the head Threaded 'upon'-the shank describedadjacent to the clamping-plate; is a nut H, which upon being turned by a suitable socket-wrench inserted within the shaftbore draws-the wedge and clamp together. The head'is thus expanded within the shaft and thepacking compressed to cover the section-joints for the purpose set forth.

I preferably use in connection with the headfuse-rings, such as 1), arranged in suitable grooves o in the sections. Also to prevent the stopper from working loose within the shafting-I employa lock-nut I, as plainly shown in the drawings. a

In Fig. 4 I have shown a modified type of stopper particularly adapted for use in boiler- -tubes.' In this figure J designates a boiler- .-head," K one of the boiler-tubes, the latter being provided'with a bead L, which partially overlaps the head. The construction of the plug is similarto thatfdesoribed, with the exception that at its lower end the wedge flares, as at M. Inexpanding the head to fix the stopper within the tube the flaring portionM is drawn tightly against the lower edge of the head-sections, forming a tight joint, so as to effectively prevent leakage between the head and wedge.. Also, by locating the packingring so as to bear against the bead L of the tube, as indicated in Fig. 4, in addition to serving as a packing for the section-joints the ring when compressed forces the tube end tightly against the walls of the aperture in the 'boiler-head,-.thereby forming a tight con nection between the parts. 1

What I claim-as my invention is- 1. The combination with a hollow metallic member, of a stopper therein comprising an .expansible head formed in sections,compressible material covering thejoints between adjoining sections of the head, and means for expanding the head and thecompressible material.

2. A stopper for boiler-tubes or hollow shafting, comprising an expansible head formed in sections and having an opening extending longitudinally therethrough,a wedge member within the opening, a shank or stem carried by the wedge projecting beyond the head, a

clamping member upon the shank, compressible material intermediate said clamping momher and the head, and means upon the shank for drawing the wedge and clamp together to expand the head and the compressible material.

3. Astopper for metallic tubing comprising an expansible head formed in sections and having a tapering opening extending longitudinally therethrough, a wedge within the opening carrying a shank or stem threaded at its free end, a clamping-plate loosely sleeved upon the shank, a ring of compressible material intermediate the plate and the head,and anut engaging the shank and bearing against the plate.

4. A stopper for boiler-tubing or hollow shafting, comprising an expansible head formed in sections and having a tapering con: ical opening extending centrally and longitudinally therethrough, a conical wedge fitting within the opening, said wedge contacting with the walls of the opening throughout the entire length of the latter and having a flaring section at its outer end abutting against the edges of the head-sections,a shank or stem integral with the wedge and projecting beyond the head, a conical clamping-plate loosely sleeved upon the shank, a ring of compressible material intermediate thehead and the plate and a nut threaded upon the free end of the stem adapted to bear against the plate.

In testimony whereof I aflix my signature in presence of two witnesses.

HENRY T. MASON.

Witnesses:

JOHN DUPUIS, PATRICK CARLIN. 

